Brush cartridge



FIG. 1 is a front-left perspective view of a brush cartridge showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left view thereof; and,

FIG. 7 is a right view thereof.

The portions of the brush cartridge shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a “brush cartridge” as shown and described. 